I started doing something like this after I came across a node a while back. I cannot find the link to the node now.

My test code was 

use B::Deparse;

my $sr = sub { print "Hello\n" };

$sr->();

my $code = B::Deparse->new->coderef2text($sr);

$code =~ s/print \s\S+/die "Bye";/;

$sr = eval "sub $code";

$sr->();

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In reply to Re^4: How to get code of the calling function or object by tmaly
in thread How to get code of the calling function or object by Anonymous Monk

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